Steam drum baffle



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H. J. KERR STEAM 'DRUM BAFFLE Filed Aug. 25, 19.28 8 Sheets-Sheet l nada uw INVENTOR ATTORNEYS 2L E933. H. J, KERR STEAM DRUM BAFFLE www FiledAug. 23, 1928 8 Sheets-Shea?, 2

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F/mdl 3,@33. H KEER STEAM DRUM BAFFLE Filed Aug. 23, 1928 8 Sheets-Sheet 3 NVENTOR L ATTORNEYS March 2l, 1933. H. J. HKERR STEAM DRUM BAFFLE Filed Aug. 23, 1928 8 Suheets-Shet 4 INVENTOR BY v ,LJ/Wr ATTORNEYS Mew-'ch Zywg. H. J. KERR STEAM DRUM BAFFLE 8 Sheets-Sheet 5 RNJ Filed Aug. 23, 1928 ATTORNEYS March zu, w33.

H. J. KERR STEAMk DRUM BAFFLE Filed Aug. 23, 1928 8 Sheets-Sheet 6 March 2l, 1933. H. J. KERR STEAM DRUM BAFFLE Filed Aug. 23, 1928 8 shets-sheet '7 r Jumbo ATTORN EYS 'March 2E, E933. H, 1 KEI-2R 1,993,912

STEAM DRUM BAFFLE Filed Aug. 23, 1928 8 sheetsdsheet s -N n Il N S lo g / NVENTOR Patented Mar. 2l, 1933 HOWARD J'. K ERR, 0F WESTFELD, NEW JERSEY, ASSIGNOR TO THE BABCOCK & AW'ILCOX 4CO1VI.".5J.\TY, OF BAYONNE, NEW JERSEY, A. CORPORATION OF NEW JERSEY STEAM DRUM BAFFLE Application filed August 23, 1928. Serial No. 301,456.

taken along the line 2 2 of Fig. 1; Fig. 3

is a section similar to Fig. 1 taken along the line 3 3 of Fig. 4 showing a modification; Fig. 4 is a section similar to Fig. 2 taken along the line 4 4 of Fig. 3; Fig. 5

5 is a section similar to Fig. 1 taken along the line 5 5 of Fig. 6 showing another modication; Fig. 6 is a section similar to Fig. 2 taken along the line 6 6 oFig. 5; Fig. 7 is a perspective View showing some of the details of Fig. 5; Fig. 8 is a section similar to Fig. 1 taken along the line 8 8 of Fig. 9 showing another modification; Fig. 9 is a section similar to Fig. 2 taken along the line 9 9 of Fig. 10; Fig. 10 is a section similar to Fig. 1 taken along the line 1G 10 of Fig. 11 showing another modification; Fig. 11 is a section similar to Fig. 2 taken along the line 11 11 of Fig. 10; Fig. 12 is a section similar to Fig. 1 taken along the line 12 12 of Fig. 13 showing another modification; Fig. 13 'is a section similar to Fig. 2 taken along the line 13 13 of Fig. 12; Fig. 14 is a section similar to Fig. 1 taken along the line 14 14 of Fig. 15 showing another modification; Fig.` 15 is a section similar to Fig. 2 taken along the line 15 15 of Fig. 14; Fig. 16 is a section similar to Fig. 1 taken along theline 1(3 16 of Fig. 17 showing a modilication; Fig. 17 is a section similar to Fig. 2 taken along the line 17 17 of Fig. 16; Fig. 18 is a section similar to Fig. 1 taken along the line 18 18 oi Fig, 19 showing another modification; Fig. 19 is a section similar to Fig. 2 taken along the line 19-19 of Fig. 18; Fig. 20

is a longitudinal section through another modification of the invention taken along the line 20-20 of Fig. 21; Fig. 21 is a section along the line 21-21 of Fig. 20; Fig. 22 is a longitudinal section viewed from below; and Fig. 23 is a section along the line 2,3 23 of Fig. 21.

ln all the figures of the drawings reference character 1 indicates a steam and water drum of a boiler into which rows of circulating tubes 2 enter for introducing a mixture of steam and water.

1n the embodiment shown in Figs. l and 2 a shutter balile 3 is provided near the inlet end of the tubes 2 comprising spaced parallel inclined plates 3; the uppermost one of which has its upper edge in Contact.

with the wall of the drum to prevent steam and water from passing upwardly along the inside wall of the drum. A vertically disposed baille 4 is located on the other side of the plates 3 from the tubes 2 and extends both above and below the normal Water level in the drum. The space between the ends of the baiiie 4 and the inside wall of the drum is closed by the end plates 4 to prevent steam from passing around the ends of the battle 4. The upper edge of the baie 4 is curved inwardly as indicated at 5 toward the plates 3 and a horizontal baile 6 extends from baflie 4 near the upper edge and is located on the other side from the tubes 2. A swash plate 8 is located on the other side of the drum from the tubes 2 and extends from a line on the drum below the normal water level from substantially one end of the drum to the other to aid in keeping the water in the drum quiet.

A. dry pan is located above the horizontal bali'le 6 and comprises an inclined bottom plate 9, one edge of which contacts with the inside wall of the drum and the other edge of which is connected to the lower edge of the side wall 10 of the dry pan. rlhe wall 10 is perforated with numerous pan are closed by end plates 12. A curved baffle or drip plate 13, concave on its lowerside, extends from the inclined bottom 9 downwardly toward the horizontal baiie 6, thus leaving a space for the steam to pass through. `The baffle plates and other members inside of the drum are retained in fixed positions by means of brackets (not shown) or in any other well known or convenient manner.

The operation of the embodiment illustrated in Fig. 1 is as follows: The mixture of steam and water enters a compartment having a side wall 4 and end walls 4 extending below the normal water level in the drum 1. The compartment has an opening at the top. The :mixture of steam and Water enters through the rows of tubes 2 and strikes the shutter baie or inclined plates 3, Iand due to the change in velocity and ydirection the main portion of the water is separated out and collects in the lower portion of the drum 1. The steam, and whatever water may remain mixed therewith, pass approximately in the direction of the arrows and is changed suddenly in direction by means of the curved edge 5, and again reverses, passing between the plates 6 and 9 where the drip plate 13 aids in separating out moisture that may be in the steam even though it might be in the form of very nely divided spray. The drip plate 13 allows the fine particles to collect in drops heavy enough to fall through the moving stream. The dry steam then passes through the perforations 11 into the dry pan and thence out through the steam outlets 14. As will be clear from Fig. 2, which illustrates one end of the device, the plates 3, 4, 5, 6, 13 and 9 extend substantially from one end of the steam and water drum 1 to the other. It will also be clear that the steam passes from ythe inlet tubes2 to the dry pan at all times in directions substantially at right angles to the length of the drum. The dry pan rvis shallow so that a considerable distance is i', leftbetween the bottom of the dry pan and the water level in the drum, thus providing space for the transverse passage of the steam without causingthe steam to disturb steeply inclined than in the surface of the water seriously or carry moisture from the surface to the dry pan.

In; the modificationshown in Figs. 3 and 4, the shutter bales 3 are wider and less Fig. 1. In this iigurefthe'vertical plate 4 is located on the other sideof'the center line from the tubes 2.

`Alsofin this modification, the plate 5 at the upper edge of the Vplate 4 is much wider 4 than that shown` in Fig. 1 and is approximately parallel to the plates 3.

l'The baffle plate 15, is approximately parallel to 'the tacts with lthe inside of the drum. It is plate 5 and its upper edge con-` provided with a drip plate 16 and its lower edge is bent downwardly at 17 to serve also as a drip plate. A vertical balile 18 extends from the drum a short distance downwardly in a plane slightly offset from the lower edge of the plate 15. The dry pan 19 is of the box t e and its bottom 20 is provided withper orations for the dry steam to enter. It will be obvious that 'in this modiication the steam will be reversed in direction several times during its passage from the tubes 2 to the dry pan and the Walter will be well separated from the steam. In this modification the plates 3 are shown as being more nearly horizontal than the corresponding plates 3 shown in Fig. 1. The plates are made inclined so as to cause a change in the direction of the entering mixture of steam and water for separating out the water but theplates are given a minimum inclination to avoid the danger of causing the steam to impinge violently against the surface of the water in the drum and disturb it.

In the modification shown in Figs. 5, 6, and 7 a series of spaced, inclined, narrow plates 28 extends from near the top of thev distance below the normal water level in the drum. An inclined baille 25 is located on the other side of the plates 21 from the tubes 2 in such a position that the steam is 'caused to pass around the lower edge thereof before it passes into the box type dry pan 26 through the perforated bottom 27 thereof.

In the modification shown in Figs. 8 and 9 the parts 3, 4, 4', 5 and 6 are similar to those already described. The baie 31 extends from the wall of the drum 1 along a line approximately above the upper edge'of the extension 5 in a downwardly inclined direction and its lower edge is curved and terminates a short distance above the horiz`ontal baiile 6. A horizontal balile 32 extends over the bale 31 below the dry pan 26 which is similar to that described in connection with Fig. 5. A baille 33 projects radiall water rum on the other side from the tubes 2 above the normal water level and prevents any particles of liquid from being swept along the inside wall of the drum to the dry an.

The modi cation shown in Figs. 10 and 11 tical baile 34l is provided near the edge ofv from the wall of the steam and tentera the horizontal bame 6 and is spaced a slight distance therefrom, for the purpose of catching some of the entrained water and permitting it to pass downwardly into the lower portion of the steam and water drum. rThis vertical baffle 34 also gives an addition change in direction for the steam and the water. caught on this baille passes into the water space of the drum clear of the steam ow.

ln the modification shown in Figs. 12 and 13 the extension plate 5 is curved around as shown at 34 so as to be approximately parallel to the upper wall of the drum 1 and its lower edge is lcurved inwardly as indicated at 35. The dry pan comprises a horizontal imperforate bottom that extends from near the edge of' the curved plate 34 and is attached to the vertical side 37 that is perforated for the admission of the dry steam. Nipples 38 extend from the dry pan through the curved plate 34 lets 14 for the steam.

lfn this modification the steam, after striking the plates 3 and having most of the to the outwater separated therefrom, passes through the space between the plate 34 and the upper portion of the drum, thence around the edge 35 as indicated by the arrows through the perforated wall 37 into the dry pan and thence into the steam outlets.v rlhe water is separated from the steam while passing around the plate 34 by centrifugal force, 'the water being thrown outwardly onto the drum sheet along which it passes downwardly. rlhe steam `itself passes through the perforations in the plate 37.

ln the modification shown in Figs. 14 and 15 the parts 3, 4, 4', and 5 are similar to those already described. ln this modification the baille 6 has its edge next to the plate 4 curvedto a greater radius and the main portion of this baffle is located lower in the drum than is'the case in Figs. 8 and 10, for example. fn this modification the inclined baffle 40 that corresponds somewhat to the baille 31 in Figs. 8 and 10 also extends lfarther downwardly into the' drum, thuscausing the steam to travel downwardly over a longer path before it enters the dry pan.

The modification shown in Figs. 16 and 17 differs mainly from that shown in Figs. 14 and 15 in that the horizontal baille 6 is located at a higher point and the inclined baille 40 does not extend so far downwardly, thus giving more clearance between the horizontal plate 6 and the water level in the drum. Also, in this modification, the dry pan is somewhat different and nipples 41 are shown and extend through the dry pan to the safety valve outlets 42 .so that when the 'safety valves open the waste steam will not have to pass through the dry pans.

This feature may also be used in connection with the other illustrative embodiments of the invention.

ln the modification shown in Figs. 18 and 19, the parts 3, 4, 4, 5 and 6 are similar to those already described. In this modification the inclined plate 40 is more nearly horizontal anda slightly inclined bafile plate 43 extends from this plate and terminates in a downwardly bent lip or drip 44 around which the steam passes on its way to the dry pan. The bottom 45 of the dry pan extends from the drum on one side to the plate 40 on the other side. Perforations 45 in this plate are preferably arranged toward the edge that is remote from the free edge of plate 43 around which the steam passes.

ln the modification shown in Figs. 20 and 23, the upper portion of the uppermostplate 3 is vertically disposed as shown at 3 A dry pan baflie 46 is located in the steam space of the steam and water drum and extends across the drum from a point above the upper .edge offplate 4 and its extension 5, and is provided with an inclined drip ledge 47 and also with an opening 48 near the side of the drum opposite the tubes 2. rlhe bafHe 46 is so constructed that the edges on opposite sides of the opening 48- are inclined downwardly generally opposite to the direction of flow of steam through the opening 48. rlhe dry pan 49 is located above the baille 46 and is spaced a short distance therefrom. Safety valve outlets 50 are provided at the top of the steam and water drum l and nipples 50 extend from these outlets 50 through holes in the dry pan 49. rl`he bottom of the dry pan 49 is provided with rows of holes or openingsl 51 that may be arranged in groups between the openings for the nipples`50. Steam' outlets 52 vare provided some dist-ance apart and the openings 51, preferably of uniform size, are less numerous and farther apart near the outlets l 52 than they are at farthery distances therefrom. L

VI claimr.

l. A baille for a steam and wat-er drum comprising shutter plates and means comprising a plate extending above and below the normal water level in said drum to change the direction of travel of steam after it leaves said plates and before it leaves said drum, said last named plate having its upper edge inclined towards the steam inlet to said drum.

2. In a steam and water drum, a plurality of spaced inclined 'plates near the steam inlet to said drum, and a vertically disposed plate on the other side of said plates from the steam inlet, the upper edge of said plate extending towards the steam inlet.

3; A steam and water drum, a. plurality of spaced inclined plates near the steam inlet to said drum, a vertically disposed plate on the other side of said plates from steam inlet, an extension the steam inlet, the upper edge of said plate extending towards the steam inlet, and a horizontally disposed baille on the other side of said plate.

4. Ina steam and water drum, a plurality of spaced inclined plates near the steam inlet to said drum, a vertically disposed plate on the other side of saidv plates from the steam inlet, a baille above the upper edge of said plate and a drip ledge on said bailie.

5. Ina steam and water drum, a plurality of spaced inclined plates above the normal water level in said drum near the steam inlet to said drum, a vertically disposed plate on the other Side of said plates from the steam inlet, a bailie above the upper edge of said plate and a steam outlet above said last named bail1e.` v

' 6. In a steam and water drum, a plurality oi.k spaced inclined plates near the steam inlet to said drum, a vertically disposed plate on the other side of said plates from the steam inlet, and an extension from `the upper edge of said plate substantially as long as said plate and having a portion thereof approximately parallel to the upper part of said drum.

7. In afsteam and water drum, a plurality of spaced inclined plates near the steam in-y let to said drum, a vertically disposed' plate on the other side of said lates from the rom the upper edge of said plate substantially as long as said plate and having a portion thereof approximately parallel to the upper part of said drum, and a steam outlet from the space below said extension portion.

8. In a steam and water drum, a plurality of spaced inclined plates near the'steam inlet to said drum, a vertically disposed plate on the other side of said plates from the steam inlet, the upper edge of said plate extending towards thesteam inlet, a hori- ,zontally disposed baiiie on the other side of said plate and a vertically dis osed baille near the edge of said horizontal y disposed baille. f 'f n 9. A bale for a steam and water drum comprising a plurality of substantially flat inclined plates above the normal water level in said drum, aV dry pan, a balie below said dry pan, and a vertically disposed plate extending some distance on opposite sides of the normal water level in said drum located between said inclined plates and said baiiie.

f 10. In a steam and water drumhaving an `inlet and outlet, a plurality o'f spaced inclined plates forming steam passages near the steam inlet to said drum, another in-v clined plate on the other side of said lates from the steamninlet, the upper edge o said last named plate extending towards the steam inlet, and the said last named plate being located adjacent the steam outlet in position to cause the steam passing through 

